Production and processing technology for titanium chloride with high stability

Abstract

The invention provides a production and processing technology for titanium chloride with high stability. When titanium chloride is produced with a fused salt chlorination process, high-temperature titanium chloride gas produced in a fused salt chlorination furnace and containing chloride impurities is subjected to dust collection by a dust collector and then enters a leaching tower for leaching with a titanium chloride liquid, a water spray nozzle is arranged at the top of the leaching tower and sprays water by introduction of chlorine, water entering the leaching tower is subjected to a hydrolysis reaction with low-melting-point complexes such as NaAlC14 and NaFeC14 entrained in the titanium chloride gas as well as AlCl3, aluminum oxide and ferric oxide are produced, enters a leaching tank in the leaching tower with titanium chloride and are mixed into mud slurry, and the mud slurry in the leaching tank is returned to the dust collector for dust collection. The production and processing technology for titanium chloride has the advantages as follows: the low-melting-point complexes such as NaAlC14 and NaFeC14 in a side reaction can be removed, and long-term stable operation of a fused salt chlorination reactor system is guaranteed.

Description

technical field [0001] The invention relates to a production and processing technology of highly stable titanium chloride. Background technique [0002] At present, large-scale molten salt chlorination production technology is a mature technology in China, and the alumina component in the titanium-rich material will be chlorinated to form AlCl in the process of carbon chlorination. 3 , The chlorination rate is usually above 50%. AlCl 3 It is a layered structure in the solid state and will convert to Al when it is close to its melting point temperature 2 Cl 6 The molecular structure of the dimer vapor molecules volatilize into the gas phase; when the temperature rises further, the dimer molecules decompose into AlCl 3 molecular. In molten salt chlorination system, FeCl 3 Behavior with AlCl 3 similar. In the molten salt chlorination reactor, the product AlCl 3 , FeCl 3 It may form a chloride complex NaAlCl with relatively low saturated vapor pressure with NaCl or KCl...

AI Technical Summary

Problems solved by technology

Since the crude titanium chloride underflow slurry produced by leaching in the leaching tower is directly returned to the dust collection or chlorination system, it will be gasified again, thereby continuously circulating and accumulating in the chlorination-dust collection-leaching system, which not only increases the The burden on the system can also easily cause problems such as system wall formation, partial liquefaction of dust collection slag, and scaling of heat exchangers, which will affect the continuity and stability of chlorination operation

In addition, NaAlCl 4 , NaFeCl 4 and a small amount of AlCl 3 It will also affect the follow-up TiCl 4 Refining and production of sponge titanium have adverse effects, and as a very acidic Lewis acid, it is highly corrosive to steel equipment

It has caused great difficulties to stabilize the production cycle of titanium chloride products